Measuring Matter

Metric System / System of International Units (SI) There are seven base units. SI term What it DoesAbbreviation Meterfor lengthm Kilogramfor mass; appliedkg to weight in every- day terms Kelvin temperatureK Secondtimes Ampereelectric currentA Candelaluminous intensity cd Moleamount of substancemol

Why use Metric It is simple: it only uses 3 base units of measure. Meter: Length Gram: mass Liter: capacity It is simple: uses a base of 10

English Units / US Customary Units

Mass A measure of how much matter is in an object.

Weight or Mass? ~Weight is a measure of the force of gravity on you. ~On Earth, all objects are attracted downward by Earth’s Gravity. ~Other planets, the force of gravity maybe more or less. ~On Earth everyday life, weight can be useful in measuring matter of an object. ~Scientist rely on the measurement of mass rather than weight. ~Weight can change depending upon location (gravity)

Volume The amount of space that matter occupies. All forms of matter have volume. Finding volume: Volume = Length x Width x Height When you multiply the three measurements, you must multiply the units as well as the numbers. 2 x 2x 2= 2(3)2cm x 2cm x 2cm = 8cm3

Volume cm3 is Cubic Centimeter How can you measure the volume of an irregular shape, Put the object in a graduated cylinder containing water and measure the change in volume of the water.

Density Substances may have the same mass but don’t fill the same volume. density is the measurement of how much mass is contained in a given volume. To calculate density: Density = Mass volume A unit of density is always a unit of mass. Units of density written: g/cm3 or g/mL